31=r+12

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Solution for 31=r+12 equation:


Simplifying
31 = r + 12

Reorder the terms:
31 = 12 + r

Solving
31 = 12 + r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-1r' to each side of the equation.
31 + -1r = 12 + r + -1r

Combine like terms: r + -1r = 0
31 + -1r = 12 + 0
31 + -1r = 12

Add '-31' to each side of the equation.
31 + -31 + -1r = 12 + -31

Combine like terms: 31 + -31 = 0
0 + -1r = 12 + -31
-1r = 12 + -31

Combine like terms: 12 + -31 = -19
-1r = -19

Divide each side by '-1'.
r = 19

Simplifying
r = 19

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